水驱后期断块油藏CO_(2)气顶与人工边水组合驱压力恢复规律  

Pressure recovery of CO_(2) gas cap and artificial edge water combined flooding in fault-block reservoirs at late stage of water flooding

作　　者：刘炳官[1] 林波[2] 王智林 孙东升[2] 葛政俊[2] 顾骁 LIU Bingguan;LIN Bo;WANG Zhilin;SUN Dongsheng;GE Zhengjun;GU Xiao(Jiangsu Oilfield Company,SINOPEC,Yangzhou City,Jiangsu Province,225009,China;Exploration and Development Research Institute,Jiangsu Oilfield Company,SINOPEC,Yangzhou City,Jiangsu Province,225009,China)

机构地区：[1]中国石化江苏油田分公司,江苏扬州225009 [2]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《油气地质与采收率》2021年第5期87-93,共7页Petroleum Geology and Recovery Efficiency

基　　金：中国石化科技项目“苏北复杂断块低渗油藏注CO2技术及应用”(P16050)和“苏北盆地含水层CO2封存潜力及技术研究”(P21075-4)

摘　　要：水驱后期断块油藏注入水无效循环造成压力提升困难,所提出的CO_(2)气顶与人工边水组合驱技术被认为可有效解决该问题。为了研究组合驱储层压力恢复规律,对压力恢复速度与注入速度等参数的关系、以及注水、注气速度和注入时机的优化开展研究。因此,利用室内实验评价压力恢复速度与注气量、注气速度及注气注水速度比之间的定性关系;应用数值模拟方法,结合单因素分析法及正交试验设计法验证实验结果,采用响应面分析法建立压力恢复速度与三者之间的定量关系,回归了相关性预测模型。最终对比优化了组合驱技术政策。研究结果表明,组合驱效果与注入速度、注气量及注气注水速度比呈正相关,对于注气速度最敏感。组合驱注气速度与注水速度存在最优值与最优匹配关系,进而建立了组合驱注入时机确定图版。At the late stage of water flooding,the invalid circulation of injected water in fault-block reservoirs makes it difficult to increase pressure.The proposed combined flooding technology of CO_(2) gas cap and artificial edge water is considered as an effective solution to this problem.In order to study the pressure recovery of combined flooding reservoir,the relationship between pressure recovery rates and injection rates,as well as the optimization of water injection rate,gas injection rate and injection time were studied.Indoor experiments were conducted to evaluate the qualitative relationship of pressure recovery rates with gas injection volumes/rates and injection rate ratios between gas and water.Based on numerical simulation,single-factor analysis and orthogonal experiment design were combined to verify the experimental results.The quantitative relationship of the pressure recovery rates with the above three factors was established by response surface analysis,and the correlation prediction model was regressed.Finally,the technical policies for combined flooding were comparatively optimized.The research results show that the combined flooding effect is positively correlated with the injection rates,gas injection volumes/rates,and injection rate ratios between gas and water,and it is most sensitive to the gas injection rates.There are optimal gas/water injection rates for combined flooding and an optimal matching relationship between them,and then a chart for determining the injection timing for combined flooding is given.

关 键 词：组合驱 压力恢复速度 响应面分析 最优速度组合 组合驱注入时机 

分 类 号：TE347[石油与天然气工程—油气田开发工程]